package com.yjd.comm.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.digest.DigestUtils;

/**
 * 
 * @ClassName: MD5
 * @Description: MD5算法
 * @author ready likun_557@163.com
 * @date 2014-8-12 下午1:29:41
 */
public class MD5 {
	// 全局数组
	private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	public MD5() {
	}

	// 返回形式为数字跟字符串
	private static String byteToArrayString(byte bByte) {
		int iRet = bByte;
		if (iRet < 0) {
			iRet += 256;
		}
		int iD1 = iRet / 16;
		int iD2 = iRet % 16;
		return strDigits[iD1] + strDigits[iD2];
	}

	// 返回形式只为数字
	@SuppressWarnings("unused")
	private static String byteToNum(byte bByte) {
		int iRet = bByte;
		if (iRet < 0) {
			iRet += 256;
		}
		return String.valueOf(iRet);
	}

	// 转换字节数组为16进制字串
	private static String byteToString(byte[] bByte) {
		StringBuffer sBuffer = new StringBuffer();
		for (int i = 0; i < bByte.length; i++) {
			sBuffer.append(byteToArrayString(bByte[i]));
		}
		return sBuffer.toString();
	}

	/**
	 * 
	 * @Title: GetMD5Code
	 * @Description: 返回某个字符串的md5值
	 * @param @param strObj
	 * @param @return 设定文件
	 * @return String 返回类型
	 * @throws
	 */
	public static String GetMD5Code(String strObj) {
		String resultString = null;
		try {
			resultString = new String(strObj);
			MessageDigest md = MessageDigest.getInstance("MD5");
			// md.digest() 该函数返回值为存放哈希值结果的byte数组
			resultString = byteToString(md.digest(strObj.getBytes()));
		} catch (NoSuchAlgorithmException ex) {
			ex.printStackTrace();
		}
		return resultString;
	}

	@SuppressWarnings("static-access")
	public static void main(String[] args) throws UnsupportedEncodingException {
		// 67d8e90e539074574c2b6a25c7e220a3
		/*
		 * String charset = "gbk";
		 * System.out.println(DigestUtils.md5Hex((DigestUtils.md5Hex(DigestUtils
		 * .md5("lin715674040".getBytes(charset))) + "m6LHya"
		 * .getBytes(charset)).getBytes(charset)));
		 */

		// 原密码
		String password = "111111";
		// 盐
		String yan = "111111";
		System.out.println(String.format("原密码:%s 盐:%s", password, yan));
		System.out.println(String.format("MD5(%s):%s", password,
				DigestUtils.md5Hex(password)));
		System.out.println(String.format("MD5(MD5(%s)+%s):%s", password, yan,
				DigestUtils.md5Hex(DigestUtils.md5Hex(password) + yan)));
	}
}
